Refrigerating apparatus



July 25, 1939. E NZ 2,167,264

REFRIGERATING APPARATUS I Filed April 6, 1957 W'ITNESSBS; iNVBNTOR.

wq I L n/$92442.

Patented July 25, 1939 UNITED STATES PATENT OFFICE Application April 6,1937, Serial No. 135,292 In Germany April 14, 1936 1 Claim.

My invention relates to a refrigerating apparatus which is built as adry absorption machine and has for its object the application of anindifferent liquid in the boiler.

Reference is to be had to the accompanying drawing in which Fig. 1 showsa section through the apparatus,

Fig. 2 shows a section according to line w-b of the Fig. 1,

Fig. 3 shows a top view.

The boiler I is fitted with the pipes I which carry electrical heatingcoils. One end 2 of the pipe 4 reaches nearly to the bottom of theboiler I0 and the other end 3 is fixed to the top of the evaporator 9.The perforated plates II are fixed to the boiler I0 and dry absorptionmaterial I5 for instance calcium chlorid is placed on the plates I I. Aliquid I2 for instance parafilne oil rests on the bottom of the boilerIII. The liquid is indifferent to the refrigerant fluid used and is notaffected by the changing temperatures. The end 2 of the pipe 4 iscovered by the liquid I2. The latter is placed for away from the heatingpart of the boiler. The lower part of the boiler can be cooled by waterif necessary. The pipe 6 arranged in the upper part of the boiler leadsto the condenser I and to the bottom of the evaporator 9. The end 5 iscovered by liquid refrigerant for instance ammonia.

The apparatus works in the following way: The heating coils of the pipesI are heated during the heating period, which transmit heat to theboiler. The effect of the heat is that the vapors of the ammonia areseparated from cal- 35 cium' chlorid and the vapors are led through thepipe 6 into condenser I where the vapors condense to liquid and theliquid thus formed passes through the end of pipe 5 to the liquidammonia 8 in evaporator 9. The ammonia is collected as liquid in thebottom of the evaporator 9. As the end 2 of the pipe 4 is shut by theliquid I2 the vapors of ammonia cannot reach the evaporator through thepipe 4. As soon as the level of the liquid 8 has reached a certainheight, the heating of the electrical coils of the pipes I is stoppedand the cooling period starts. The temperature decreases and at the sametime the pressure decreases. The liquidammonia 8 starts to evaporate andthe vapors flow to the boiler I0 through the end 3 of the pipe 4, theend 2 and the liquid I2. The vapors are absorbed by the calcium chlorid.Coldness is effected by the evaporation of the ammonia. Thecharacterising feature of the apparatus is that the vapors of thecooling liquid flow through the condenser only during the heatingperiod, while they do not flow through the condenser during the coolingperiod. Therefore the vapors flow through two different passages. Onepassage is shut in the boiler by the indifferent liquid and the otherpassage is shut in the evaporator by the liquid ammonia.

I claim:

In an absorption apparatus the combination of a boiler and anevaporator, fitted with refrigerant fluid partly in the liquid and.partly in the vapor state, a solid absorbent material located onperforated plates in the top of the boiler and liquid, indifferent tothe refrigerant fluid used and not afiected by the changingtemperatures, located in the bottom of the boiler, closing the end of apipe leading directly to the top of the evaporator, another pipe leadingfrom the top of the boiler to a condenser which is connected to thebottom of the evaporator.

CARL EUGEN DUNZ.

